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Are you refering to a siped(sp?) tire? That is where they make a series of diagonal cuts across the face of the tread about an inch apart. They do make a difference on ice and snow and seem to keep the tire cooler in the summer time.
Alan do you have more info on this or know were i might find the info . we put new tires on our winch truck and there junk ,$3,300 dollars worth of junk. Just trying to salvage them any way we can .
Trouble
alot of people cut super swamper boggers to make them into more of a paddle tractor type tire by cutting the litte lugs completely out and leaving the large lugs
1985 F-150/351Ho/4wd/6inch with 33's
1979 f-250 429/4spd/5inchwith 36 inch buckshot mudders
on a quiet night your can hear a chevy (lol,you can watch a dodge) rusting away
Check out any of the off-road racing series, CORE being one, they do this almost every race and in every class. There does seem to be some method to the way they are done depending on the track conditions. They usually remove every 3rd or 4th lug at least from mud type tires in "heavy" mud to help clean out the tread and will cut an extra groove or two all the way around the tire if it's dry, this gives better turning grip in these conditions. It really does seem to depend on what type of surface your working them on as to what type of "grooving" you will need.
I don't know if you have seen them yet, but ProComp has tires with there name on them now. One of them is an all-terrain and the other is a mud terrain. The mudder has sipes in it which is rare for a mud tire. I was thinking of getting them when I'm due for a set, decent price too.